#!/bin/bash
# Zero-Downtime Reload Script
# Validates config first, then reloads NGINX gracefully.

CONTAINER_NAME="nginx-proxy"

echo "[Reload] Checking configuration in $CONTAINER_NAME..."

# 1. Validate Configuration (nginx -t)
if docker exec "$CONTAINER_NAME" nginx -t; then
    echo "[Reload] Configuration is VALID."
else
    echo "[Reload] ❌ Configuration is INVALID. Aborting reload."
    exit 1
fi

# 2. Graceful Reload (nginx -s reload)
# This starts new workers with new config, while old workers finish requests.
echo "[Reload] Triggering graceful reload..."
if docker exec "$CONTAINER_NAME" nginx -s reload; then
    echo "[Reload] ✅ Reload signal sent successfully."
    echo "[Reload] Zero-downtime update in progress."
else
    echo "[Reload] ❌ Failed to send reload signal."
    exit 1
fi